package com.atguigu.netty.buffer;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;

import java.nio.charset.StandardCharsets;

public class NettyByteBuf02 {
    public static void main(String[] args) {
        ByteBuf byteBuf = Unpooled.copiedBuffer("hello world!", StandardCharsets.UTF_8);
        //使用相关的方法
        if(byteBuf.hasArray()){//true
            byte[] content = byteBuf.array();
            //将content转成字符串
            System.out.println(new String(content,StandardCharsets.UTF_8));
            System.out.println("byteBuf="+byteBuf);
            System.out.println(byteBuf.arrayOffset());// 0
            System.out.println(byteBuf.readerIndex());// 0
            System.out.println(byteBuf.writerIndex());// 12
            System.out.println(byteBuf.capacity());// 64

            int len=byteBuf.readableBytes();
            System.out.println(len); //可读字节数

            //使用for取出各个字节
            for (int i = 0; i < len; i++) {
                System.out.println((char)byteBuf.getByte(i));
            }
            System.out.println(byteBuf.getCharSequence(0,4,StandardCharsets.UTF_8));
        }
    }
}
